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'''Technetium''' is a chemical element with symbol '''Tc''' and atomic number 43. It is the lightest element of which all isotopes are radioactive; none is stable nuclide|stable. Nearly all technetium is produced synthetically, and only minute amounts are found in the Earth's crust. Naturally occurring technetium is a spontaneous fission product in uranium ore or the product of neutron capture in molybdenum ores. The chemical properties of this silvery gray, crystalline transition metal are intermediate between rhenium and manganese. Many of technetium's properties were predicted by Dmitri Mendeleev before the element was discovered. Mendeleev noted a gap in his periodic table and gave the undiscovered element the provisional name ''Mendeleev's predicted elements|ekamanganese'' (''Em''). In 1937, technetium (specifically the technetium-97 isotope) became the first...
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